Physiologic correlates to running performance in pre-pubertal distance runners

In adults, four major variables have been shown to be associated with success in distance running performance: submaximal oxygen consumption (running economy), peak oxygen consumption (Peak VO2), ventilatory threshold (VT) and fractional utilisation (FU). The primary aim of this study was to describe the relationship between the 3000 m race times of run-trained prepubertal boys to these four variables. Thirteen male run-trained pre-pubertal boys (age 11.7 +/- 1.1 yrs, mean +/- SD), volunteered to take part in a 3000 m time trial and laboratory assessment, consisting of treadmill running at four submaximal speeds (8, 9.6, 11.2 and 12.8 km.h-1) as well as a peak VO2 test. The group demonstrated a heterogeneous array of peak VO2 data. A high level of association (p < 0.05) was found between mass-relative peak VO2 and 3000 m time trial results (r = -0.83). In addition ventilatory threshold expressed as %peak VO2, VO2 at VT and estimated velocity at VT was also highly related to 3000 m time trial (r = -0.78, -0.77 and -0.77) respectively. Fractional utilisation (%peak VO2) was significantly (p < 0.05) associated with race time at the final two submaximal running speeds only (11.2 and 12.8 km.h-1) (r = 0.61 and 0.67, respectively). Respiratory Exchange Ratio (RER) was also found to be significantly (p < 0.05) associated with 3000 m race time at 11.2 and 12.8 km.h-1. Overall peak VO2 appeared to be the single most important factor associated with success at 3000 m.     

Familial correlates of aggression in nondelinquent male children.

An extension of the Sears' studies of lower class families based on a 5-year period of direct home observation of the family group. The aggressive children were more closely supervised by parents, had dominant mothers, were exposed to inconsistent methods of discipline, and had parents who were punitive but placed low demands on the children. From Psyc Abstracts 36:01:3FG79M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Physiological and neuropsychological correlates of hostility

This experiment tested two hypotheses linking right cerebral arousal to hostility and physiological arousal. A replication of previous research supporting heightened physiological (systolic blood pressure, diastolic blood pressure and heart rate) reactivity among high-hostility subjects was partially successful. Hemispheric lateralization of cerebral activity in response to stress was also measured. Low- and high-hostility subjects were identified using the Cook-Medley Hostility Scale (CMHS). Physiological measures (systolic blood pressure, diastolic blood pressure and heart rate) were recorded and dichotic listening procedures were administered before and after administration of the cold-pressor paradigm. The primary finding of this research was greater right cerebral activation to stress among high-hostility subjects, as indicated by their enhanced ability to identify syllables presented to the left ear. Data further supported previous findings of heightened physiological reactivity to stress among high-hostility subjects and suggest a positive relationship between right cerebral activity and cardiovascular arousal.     

Physiological correlates of learned helplessness in man.

Assessed physiological correlates (heart rate, skin resistance, and GSR) of learned helplessness in 48 undergraduates. One group of Ss was pretreated with a series of inescapable aversive tones, and the degree of impairment was measured on a subsequent solvable anagram solution task. These Ss were compared with a group pretreated with escapable aversive tones and a control group which passively listened to the tones without attempting to escape them. Results replicate the learned helplessness effect: The group pretreated with inescapable tones demonstrated greatly impaired performance at solving anagrams relative to the other groups. Moreover, the learned-helplessness group demonstrated lower tonic skin conductance levels, smaller phasic skin conductance responses, and more spontaneous electrodermal activity relative to the group pretreated with escapable tones. These are symptoms which some researchers have claimed to be associated with clinical depression. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Job experience correlates of job performance.

Although measures of job experience are frequently-used screening devices in the selection of employees, personnel psychologists have devoted little attention to their usefulness. This article quantitatively summarizes data on the relation between job experience and job performance from a total sample of 16,058. The correlation between job experience and job performance was found to be moderated by two variables: length of experience and job complexity. The highest correlations were obtained in populations with low mean levels of job experience and for jobs that place low levels of cognitive demands on employees. Results appear to be consistent with the causal model of job performance proposed by Schmidt, Hunter, and Outerbridge (1986). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Physiological response to dental anxiety in children

Live attenuated varicella vaccine elicits protection against varicella-zoster virus (VZV), but adults require two doses to achieve optimal seroconversion rates. To assess the potential role of cell-mediated immunity (CMI), T cell proliferation to VZV antigen was compared in children and adults. Mean stimulation indices (SI) in two cohorts of 39 children tested 6 weeks after vaccination were 28.6 +/- 6.21 and 22.1 +/- 3.84, whereas 20 adult vaccines had a mean SI of 9.1 +/- 0.99 (P = .04). Vaccinees had significant increases in CMI after a second dose of vaccine. At 1 year, VZV CMI was significantly lower in adults after two doses (10.0 +/- 1.13 vs. 15.6 +/- 1.77; P = .02), even though 82% of children received one dose. Limitations in the adult helper T cell response to VZV antigens may explain the need for booster doses to elicit effective immunity and the more frequent occurrence of varicella when adult vaccines are exposed to wild type virus.     

Depression in children: Prevalence and correlates.

Assessed the prevalence of severe depression in 3,020 3rd–5th graders according to the risk variables of sex, age, intellectual functioning, and family income. Also investigated was a set of variables theoretically associated with the construct of childhood depression. Data were gathered by means of peer nominations, self-ratings, teachers' observations, and pupil personnel records. Data from 508 of the children's mothers were also obtained from an individually administered, precoded interview. The overall prevalence rate of depression for Ss, based on peer nominations, was 5.2%. Of the 38 variables hypothesized to be in the domain of childhood depression, 18 correlated significantly with the peer nomination measure. Ss nominated on depressive symptoms by their peers were also nominated as unhappy and unpopular. These Ss also rated themselves as depressed. (54 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Electrophysiological and ultrasonic correlates of reproductive behavior in the male rat.

Monitored the ultrasonic vocalizations of 13 male Long-Evans rats and determined the correlation of these vocalizations with electrophysiological activity measured by chronically implanted hippocampal and cortical electrodes during mating with a female rat. Hippocampal theta rhythms were significantly correlated with high activity, mounting, intromissions, and preejaculatory excitatory behavior and were also significantly associated with 50-kHz short ultrasonic vocalizations. Postmount or postintromission behaviors (grooming, exploration) were closely correlated with an absence of ultrasonic vocalizations and the onset of irregular low-amplitude hippocampal EEG recordings. Long 22-kHz vocalizations occurred during the postejaculatory refractory period. Shorter 22-kHz vocalizations occurred during mating and were associated with unsuccessful intromissions or mounting attempts. Postejaculatory long 22-kHz vocalizations were significantly associated with irregular high-amplitude hippocampal EEG tracings, while preejaculatory short 22-kHz vocalizations were also accompanied by sleeplike irregular high-amplitude hippocampal EEG tracings with cortical spindling. Findings suggest that ultrasonic vocalizations are indicators of the sexual arousal of mating rats. (14 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Spectrum of aerobic endurance running performance in eleven inbred strains of rats

Mice homozygous for a disruption in the Mdr2 gene (Mdr2 (-/-) mice) lack the Mdr2 P-glycoprotein (P-gp) in the canalicular membrane of the hepatocyte and are unable to excrete phosphatidylcholine into the bile. These mice develop a nonsuppurative cholestatic liver disease, presumably caused by the high concentrations of free cytotoxic bile acids in bile. We generated transgenic mice that express the human homolog of Mdr2, MDR3, specifically in the liver by the use of an albumin promoter. In these mice the MDR3 P-gp is exclusively located in the canalicular membrane of hepatocytes and phospholipid excretion into bile is restored. Mice that contain the same amount of MDR3 P-gp as that of Mdr2 P-gp in wild-type mice, also excrete the same amount of phospholipids. No histopathological abnormalities were observed in the livers of these mice. In mice that express MDR3 at a higher or lower level, the phospholipid excretion correlated with the amount of MDR3 P-gp. We conclude that the human MDR3 P-gp is functionally homologous to the murine Mdr2 P-gp and that it can fully replace this P-gp in Mdr2 (-/-) mice, restoring the excretion of phospholipids into the bile. The phospholipid excretion is limited by the amount of MDR3 or Mdr2 P-gp. The excretion of cholesterol is not tightly coupled to the excretion of phospholipids in these mice, because a very low phospholipid excretion level is sufficient to give almost wild-type cholesterol excretion into the bile.     

Hippocampal cell firing correlates of delayed-match-to-sample performance in the rat

Hippocampal CA1 and CA3 neurons were recorded in rats performing a delayed-match-to-sample (DMTS) task. Complex spike cells showed significant firing peaks following sample and match responses and during delivery of water reward. Individual cells were classified into 4 subtypes according to the presence or absence of firing in each of these 3 phases. There were significant differences in delay interval firing among the 4 subtypes, but firing during the delay did not predict the correct response: 34% of the cells showed a linear change in firing during the delay. Further analyses revealed significant lever position firing biases in approximately 70% of the cells tested irrespective of subtype. The complexity of firing correlates of the neurons recorded in this DMTS task suggests that the hippocampus divides specific aspects of the performance demands of the task across different cell subtypes, which together provide sufficient information to resolve the matching-to-sample problem on any given trial.     

Ability correlates of memory performance in adulthood and aging.

The predictive relationships between an array of cognitive process and intellectual ability variables and text- and word-recall performance were examined. A sample of 584 men and women from 3 age groups (19–36, 55–69, and 70–86 years) completed a battery of 23 tasks marking 2 latent criterion variables and 10 latent predictor variables. The results indicated that (a) individual differences in process and ability variables predict performance on text and word recall, accounting for approximately half of the variance; (b) the pattern of predictors is quite similar for text and word recall; (c) age-related differences in text and word recall can be substantially accounted for by individual differences in constituent abilities, particularly indicators of verbal speed and working memory; and (d) there is some evidence to suggest that the pattern of ability–performance relationships varies across age, but such interactions appear to be relatively small. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Predicting competition performance in long-distance running by means of a treadmill test

PURPOSE: The purpose of this study was to examine the power of 16 parameters beside the individual anaerobic threshold (IAT) in predicting performance in various competition distances. METHODS: This study examined 427 competitive runners to test the prediction probability of the IAT and other parameters for various running distances. All runners (339 men, 88 women; ages, 32.5 +/- 10.14 yr; training, 7.1 +/- 5.53 yr; training distance, 77.9 +/- 35.63 km.wk-1) performed an increment test on the treadmill (starting speed, 6 or 8 km.h-1; increments, 2 km.h-1; increment duration, 3 min to exhaustion). The heart rate (HR) and the lactate concentrations in hemolyzed whole blood were measured at rest and at the end of each exercise level. The IAT was defined as the running speed at a net increase in lactate concentration 1.5 mmol.L-1 above the lactate concentration at LT. RESULTS: Significant correlations (r = 0.88-0.93) with the mean competition speed were found for the competition distances and could be increased using stepwise multiple regression (r = 0.953-0.968) with a set of additional parameters from the training history, anthropometric data, or the performance diagnostics. CONCLUSIONS: The running speed at a defined net lactate increase thus produces an increasing prediction accuracy with increasing distance. A parallel curve of the identity straight lines with the straight lines of regression indicates the independence of at least a second independent performance determining factor.     

Infant reactivity: Physiological correlates of newborn and 5-month temperament.

The relation between measures of heart period and vagal tone and infant reactivity was investigated in a longitudinal study of infants from birth to 5 months of age. At 2 days of age, electrocardiogram (EKG) was recorded and a pacifier-withdrawal task was administered. At 5 months of age, EKG was recorded, after which infants and mothers participated in a laboratory session designed to elicit positive and negative reactivity. Maternal ratings of 5-month infant temperament were also obtained. There was a significant concurrent relation between 5-month vagal tone and negative reactivity elicited in the laboratory and maternal ratings of activity level and smiling behavior. Newborn vagal tone predicted maternal ratings of frustration and fear. Moderate stability was found for infant reactivity. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Behavioral correlates of maternal depressive symptomatology in conduct-disorder children.

We contrasted two predictive models of the impact of maternal depressive symptomatology on child behavior in a study of 51 mothers and their conduct-disorder children. Relations between global measures of maternal distress and child adjustment and observational measures of mother–child interaction were examined. Children of distressed mothers were more maladjusted than children of nondistressed mothers, when maladjustment was measured on the basis of a global rating, but "better" adjusted when measured on the basis of interactional measures. Measures of maternal indiscriminate responding to the child may account for these findings. Results suggest that (a) although conduct-disorder children are generally more maladjusted when their mothers are distressed, they display this maladjustment in a selective fashion, and (b) maternal distress acts as an adverse contextual factor that maintains mother–child interactional difficulties by disrupting the attentional and monitoring skills required for contingent responding. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

WAIS and MMPI correlates of the Halstead-Reitan Neuropsychology Battery in normal male subjects

Two groups, each consisting of 24 normal young men, were given the Halstead-Reitan Neuropsychology Battery and additional tests of intellectual and personality functioning, the Wechsler Adult Intelligence Scale, the Minnesota Multiphasic Personality Inventory, the Taylor Manifest Anxiety Scale, and the Cornell Medical Index. The test (and subtest) scores were intercorrelated. No significant correlations were found between any of the personality tests and any of the subtests of the Halstead-Reitan Neuropsychology Battery. Most of the WAIS measures likewise failed to correlate with the Halstead-Reitan measures in the two samples. The exceptions were the Digit Span and Block Design subtests and the Performance Scale IG score on the WAIS which did correlate with some of the subtests from the Halstead-Reitan Neuropsychology Battery. The findings with normal subjects reported in this paper, in contrast with findings with psychopathological and brain-damaged groups of subjects reported by others, indicate that for Ss in the top half of the population in education and WAIS FSIQ, individual differences in scores on the WAIS, the MMPI, TMAS, and CMI do not materially influence performance on the Halstead-Reitan Neuropsychology Battery Measures.     

Multivariate analysis of male and female professional career choice correlates.

Personality, aptitude, achievement, and social-demographic characteristics of graduate students in 4 professional degree programs were investigated in a comparative multivariate analysis of the correlates of professional career choice. 173 male and 175 female 1st-yr graduate students in 2 traditionally male fields (law and management) and 2 traditionally female fields (education and social work) completed an extensive questionnaire. Results confirmed the central hypothesis of the study: Differences across careers for each variable were greater than differences between the sexes within careers. In contrast to previous findings, no significant sex differences were found in assertiveness, locus of control, or Machiavellianism. Sex differences were primarily confined to the variables relating to psychological masculinity–femininity and sex role attitudes. The limitations of the current design are noted, and it is stressed that these findings are correlational in nature. Preexisting dispositions and attitudes may be the best predictors of professional career choice, although it is equally possible that these attitudes and attributes are adopted after people have made their career choices (i.e., during graduate school). (23 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of 4 wk of deep water run training on running performance

The authors studied complications associated with intraventricular chemotherapy in patients with leptomeningeal metastases (LM). One hundred twenty consecutive patients with LM (71 females and 49 males) ranging in age from 10 to 72 years (median 42 years) were treated with involved-field radiotherapy and intraventricular chemotherapy using an Ommaya reservoir and intraventricular catheter system. The diagnosis of LM was determined by a combination of clinical presentation (114 patients); cerebrospinal fluid cytological studies (100); or neuroradiographic studies (42). Systemic tumor histological findings included breast (34 patients); non-Hodgkin's lymphoma (22); melanoma (16); primitive neuroectodermal tumors including medulloblastoma (10); glial neoplasms, leukemia, small cell lung, nonsmall cell lung, and colon (six each); prostate and kidney (three each); and gastric cancers (two). Sixteen patients, all with non-Hodgkin's lymphoma, also had acquired immune deficiency syndrome. Patients received one to four (median two) chemotherapeutic drugs and underwent a total of 1110 cycles of intraventricular chemotherapy (median 10). Intraventricular chemotherapy administration and diagnostic Ommaya reservoir punctures totaled 4400, with a median of 46 per patient. Complications included aseptic/chemical meningitis (52 patients); myelosuppression due to intraventricular chemotherapy (21); catheter-related infections (nine); unidirectional catheter obstruction (six); intraventricular catheter malpositioning (two); Ommaya reservoir exposure (two); leukoencephalopathy (two); and chemotherapy-related myelopathy (one). There were no treatment-related deaths; however, seven patients (6%) required additional surgery for either catheter repositioning (two) or reservoir removal (five). Seven patients with catheter-related infections were treated successfully with intraventricular and systemic antibiotic drugs, thereby preserving the Ommaya system. The authors conclude that Ommaya reservoirs are convenient and pharmacologically rational systems for administering intraventricular chemotherapy. Overall, serious complications requiring surgery are infrequent (6%) and most often secondary to catheter infections, Ommaya reservoir exposure, or initial catheter malpositioning. In the majority of instances, catheter infections may be managed medically, as may the most common complications of intraventricular chemotherapy including aseptic meningitis (43% of patients) and myelosuppression (18%).     

Visual monitoring performance in three subgroups of male delinquents.

Administered a questionnaire measuring psychopathic, neurotic, and subcultural delinquency to 268 male delinquents. 3 groups of 15 Ss each were formed from Ss who scored above the mean on 1 scale and below the mean on the other 2. It was predicted that the more psychopathic Ss would show a greater performance decrement on a vigilance task. A significant effect was found between groups and a significant decrement over trials for signals detected and RTs; psychopathic Ss performed consistently poorer than the other 2 groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Factors influencing sexual performance in male rhesus monkeys.

Describes a 5-yr retrospective study of the sexual behavior of 8 adult rhesus monkeys showing that sexual vigor declined over the years but testosterone levels in peripheral vein plasma did not. Two prospective experiments were carried out on these males during the 6th yr: (a) The 4 poorest performers were injected daily for 28 days with testosterone propionate (1 mg/kg). There was no significant increase in level of performance, and behavior was not correlated with plasma levels of testosterone either before or 24 hrs after the last hormone injection. (b) All 8 males were exposed to novel nonspecific sensory stimulation during tests of sexual behavior. Eight different adult male rhesus strangers—present in the room but not in the test cage—were used as stimuli, one for each experimental test. Sexual behavior during experimental and control tests did not differ. (44 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)